The central processing unit (CPU) is a National Semiconductor NS32000, and the operating system, named Oberon System is written fully in the object-oriented programming language Oberon.
It is an early example of an operating system using basic object-oriented principles and garbage collection on the system level and a document centered approach for the user interface (UI), as envisaged later with OpenDoc.
Ceres was a follow-up project to the Lilith workstation, based on AMD bit slicing technology and the programming language Modula-2.
On the same hardware, Clemens Szyperski[2] implemented as part of his Doctor of Philosophy (PhD) thesis[3] an operating system named ETHOS, which takes full advantage of object-oriented technologies.
A Usenet posting by Szyperski says that Oberon/F, which was later renamed to BlackBox Component Builder, incorporates ETHOS ideas and principles.